Studies of rapidly dividing embryonic animal cells revealed:
A. a cyclic production of certain proteins in
sync with the cell cycle.
B. a cyclic activation of protein kinases in
sync with the cell cycle.
C. the rapid production of cyclin proteins is
trailed by an activation of CDK enzymes.
D. inhibition of protein production blocks
mitosis.
E. All of these choices are correct.
E
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Which of these is NOT a reason that Mendel used pea plants as a model to study inheritance?
A. There are many varieties with distinct and different characteristics. B. They cannot self-fertilize. C. It is easy to control cross-fertilizations. D. The varieties he chose would show the same variant for a trait in generation after generation. E. They have large flowers.
Which species has been successfully reintroduced to the wild due to captive breeding programs?
a. Canadian bearded schmoo b. Atlantic salmon c. the American condor d. Yellowstone elk
In the Galapagos Islands, what led Darwin to suspect that species were not ‘fixed’ throughout time?
What will be an ideal response?
A child is born with a rare disease in which mitochondria are missing from certain skeletal muscle cells. Physicians find that the muscle cells function. Not surprisingly, they also find that ________
A) the muscles contain large amounts of lactic acid following even mild physical exercise B) the muscles contain large amounts of carbon dioxide following even mild physical exercise C) the muscles require extremely high levels of oxygen to function D) the muscle cells cannot split glucose to pyruvic acid